CN208971203U - The charger of automatically cutting off power source - Google Patents

Abstract

The utility model discloses a kind of chargers of automatically cutting off power source, including power input, on or off module, charging voltage and current conversion module, rechargeable battery, sampling module and comparison process module, the sampling module includes voltage detection module and current detection module, the wherein power input, on or off module, charging voltage and current conversion module, rechargeable battery is successively electrically connected, the input terminal of the voltage detection module and current detection module and the charging voltage and current conversion module output end are electrically connected, the output end of the voltage detection module and current detection module and the comparison process module input terminal are electrically connected, the output end of the comparison process module and the on or off module are electrically connected.The utility model turns off the function of light source of charger by voltage detection module, current detection module and comparison process module when realizing the power supply and charger short circuit of shutdown charger when rechargeable battery is fully charged.

Description

The charger of automatically cutting off power source

Technical field

The utility model relates to electronic circuit field, in particular to a kind of charger of automatically cutting off power source.

Background technique

Traditional charger can only carry out simple constant pressure or constant-current charge, so that the charging time is very long, charge efficiency It reduces.In addition to this, at the end of charging, traditional charger cannot automatically power off after battery is full of, people often forget by Charger is pulled up so as to cause accumulator super-charge, its service life is influenced, and can will more very generate explosion phenomenon, directly scrap.Closely It is also proposed that some chargers automatically powered off with defencive function over year.

Chinese utility model patent CN107919702A, date of publication are to disclose a kind of timing charging on April 17th, 2018 Device, including external electricity described in external power supply, transformer, control module, current detection circuit, voltage detecting circuit and electronic switch Source is used to provide power supply for control module；The control module, for judge rechargeable battery whether charging with electricity whether It is full of；The transformer connects between external power supply and control module, and the supply voltage of external power supply is converted to suitable control The voltage of module；The current detection circuit, is electrically connected with control module, for whether having electric current flowing in detection circuit, with And whether electric current is too high or too low；The voltage detecting circuit, is electrically connected with control module, for being to have electricity in detection circuit Whether pressure and voltage are too high or too low；The electronic switch, one end are electrically connected with control module, and the other end passes through data line Rechargeable battery is connect, for disconnecting the circuit between control module and battery；It further include being connected to the control module timer, display Module and relay；The timer, for recording the charging time of rechargeable battery；The display module is used for display circuit Middle electric current, voltage swing and charging time；The relay, is electrically connected with control module, for protect rechargeable battery not by Damage.

Above-mentioned timing charger is by current detection circuit, voltage detecting circuit and control module, when the electric current in circuit Or overtension, to prevent circuit to be burned, controller module can drive relay to disconnect, to protect supplying cell not burnt It is bad；When the charger data line other end does not connect electronic equipment, the current or voltage in circuit is too low, and controller module can be recognized There is no the rechargeable battery of electron equipment to charge for charger, then drives electronic switch to disconnect, data line is in off-position, from And effectively prevent child from phenomenon of getting an electric shock occurring because data line to be put into mouth.

Although timing charger can disconnect the circuit connection of rechargeable battery and charger when rechargeable battery is fully charged, It is charger and power supply there is also connection, there are power consumptions, while also bringing security risk when charger short circuit itself, such as produce Raw explosion phenomenon jeopardizes life property safety.

Utility model content

The technical problem to be solved by the present invention is to provide one kind when rechargeable battery is fully charged or charger short circuit When can turn off the charger of light source of charger.

In order to solve the above-mentioned technical problem, the technical solution of the utility model are as follows:

A kind of charger of automatically cutting off power source, it is characterised in that: including power input, on or off module, charging Voltage current transformation module, rechargeable battery, sampling module and comparison process module, the sampling module include voltage detection module And current detection module, wherein the power input, on or off module, charging voltage and current conversion module, rechargeable battery It is successively electrically connected, the input terminal of the voltage detection module and current detection module and the charging voltage and current conversion module Output end is electrical connected, the output end of the voltage detection module and current detection module and the comparison process module input terminal It is electrically connected, the output end of the comparison process module and the on or off module are electrically connected.

Preferably, the comparison process module includes comparison circuit and control circuit, the input terminal point of the comparison circuit It is not electrically connected with the output end of voltage detection module and current detection module, the output end and control circuit of the comparison circuit It is electrically connected, the control circuit and on or off module input are electrically connected.

Preferably, the on or off module is controllable switch control circuit.

Preferably, the charging voltage and current conversion module includes sequentially connected EMI filter circuit, rectifying and wave-filtering electricity Road, DC/DC converter and output rectifier and filter, the input terminal of the EMI filter circuit are defeated on or off module Outlet is electrically connected, and the output end of the output rectifier and filter is electrically connected with rechargeable battery and sample circuit respectively.

Preferably, the comparison process module, which is additionally provided with, turns circuit for lamp, and the circuit for lamp that turns includes several indicator lights, institute It states and turns circuit for lamp and control circuit electric connection, for showing the state of charger.

Preferably, the indicator light is LED light.

By adopting the above technical scheme, voltage detection module and current detection module sample charging voltage and current conversion module Voltage and current, when charging voltage, which reaches target rechargeable battery, expires piezoelectric voltage and charging current it is small to design setting value when, lead to It crosses comparison process module and realizes shutdown charge power supply translation circuit power supply, to automatically shut down the electricity of charger when realizing fully charged Source；

When charging voltage is close to zero or less than design setting value and electric current is exported most by charging voltage and current conversion module Big value turns off charging voltage and current translation circuit power supply by comparing processing modules implement, thus when realizing charger short circuit certainly The power supply of dynamic shutdown charger.

Detailed description of the invention

Fig. 1 is the structural block diagram of the charger of the utility model automatically cutting off power source；

Fig. 2 is the structural block diagram of comparison process module in the charger of the utility model automatically cutting off power source；

Fig. 3 is the structural block diagram of charging voltage and current conversion module in the charger of the utility model automatically cutting off power source.

Specific embodiment

Specific embodiment of the present utility model is described further with reference to the accompanying drawing.It should be noted that The explanation of these embodiments is used to help to understand the utility model, but does not constitute the restriction to the utility model.This Outside, technical characteristic involved in the various embodiments of the present invention described below is as long as they do not conflict with each other It can be combined with each other.

As shown in Figure 1, a kind of charger of automatically cutting off power source, including power input 1, on or off module 2, charging Voltage current transformation module 3, rechargeable battery 4, sampling module 5 and comparison process module 6, the sampling module 5 are examined including voltage Module 51 and current detection module 52 are surveyed, wherein the power input 1, on or off module 2, charging voltage and current convert mould Block 3, rechargeable battery 4 are successively electrically connected, and the input terminal of the voltage detection module 51 and current detection module 52 is filled with described The connection of 3 output end of piezoelectric voltage current transformation module, the output end and institute of the voltage detection module 51 and current detection module 52 The electric connection of 6 input terminal of comparison process module is stated, the output end of the comparison process module 6 and the on or off module 2 are defeated Enter end to be electrically connected.

As shown in Fig. 2, the comparison process module 6 includes comparison circuit 61 and control circuit 62, the comparison circuit 61 Input terminal respectively with the output end of voltage detection module 51 and current detection module 52 be electrically connected, the comparison circuit 61 Output end and control circuit 62 are electrically connected, and the control circuit 62 is electrically connected on or off module 2.

The on or off module 2 is controllable switch control circuit 62.

As shown in figure 3, the charging voltage and current conversion module 3 includes sequentially connected EMI filter circuit 31, rectification filter Wave circuit 32, DC/DC converter 33 and output rectifier and filter 34, the input terminal of the EMI filter circuit 31 and connection Turn off module 2 output end be electrically connected, the output end of the output rectifier and filter 34 respectively with rechargeable battery 4 and sampling Module 5 is electrically connected.

Comparison process module 6 in the charger of automatically cutting off power source, which is additionally provided with, turns circuit for lamp 63, described to turn circuit for lamp 63 include several indicator lights, and the indicator light is LED light, described to turn circuit for lamp 63 and the electric connection of control circuit 62, for showing Show the state of charger, when charging, controller output signal is to red light, during expression charges normal；When fully charged, controller output Signal indicates fully charged to green light；When charger short circuit, controller output signal indicates battery charger failure to amber light.

The voltage detection module 51, using the big small-power resistance sampling of resistance value, for whether having electricity in detection circuit Whether pressure and voltage are too high or too low；The current detection module 52 is sampled, such as health using the small high-power resistance of resistance value Copper wire resistance, for whether having electric current flowing and electric current whether too high or too low in detection circuit.

In the present embodiment, constant-current charge, electric current are permanent before this for the charger charging of the utility model automatically cutting off power source Fixed, voltage constantly increases, and is automatically converted to constant-voltage charge when charging voltage reaches when target charging equipment provides full piezoelectric voltage, In constant-voltage charge, voltage is constant, electric current be it is smaller and smaller until charging current be less than design setting value when charging is automatically closed Input power.

When charging, 220V alternating current is first become high voltage direct current by rectification circuit by charger, then passes through switch again Pipe becomes hf and hv pulse, becomes action of low-voltage pulse by transformer again later, and the specific value of low pressure depends on being electrically charged setting Standby required voltage.Finally, action of low-voltage pulse becomes corresponding direct current through over commutation, voltage regulator circuit.That is, from 220V Alternating current provides that the process of the completely direct current of piezoelectric voltage can mainly pass through rectification circuit, transformer, pressure stabilizing to target charging equipment Circuit etc..

The charger of the utility model automatically cutting off power source realizes process:

Fully charged to automatically shut power off: charging voltage reaches target rechargeable battery 4 when expiring piezoelectric voltage and fills in charging process Electric current it is small to design setting value when, compare by comparison circuit 61, control circuit 62 exports cut-off signals and gives on or off mould Block 2 realizes the power supply of shutdown charging voltage and current conversion module 3, the power supply of charger is automatically shut down when fully charged, avoids and fills Battery overcharges, while also reducing the electrical source consumption of charger, saves the energy.

Short circuit is automatically shut power off: charging voltage close to zero or is less than design setting value and electric current for charge power supply change when short-circuit The maximum value that parallel operation is exported, compares, control circuit 62 exports cut-off signals on or off module 2 by comparison circuit 61, The power supply for realizing shutdown charging voltage and current conversion module 3, automatically shuts down the power supply of charger when short-circuit, it is hidden to eliminate safety Suffer from.

The embodiments of the present invention is explained in detail in conjunction with attached drawing above, but the utility model is not limited to be retouched The embodiment stated.For a person skilled in the art, right in the case where not departing from the utility model principle and spirit These embodiments carry out a variety of change, modification, replacement and modification, still fall in the protection scope of the utility model.

Claims (6)

1. a kind of charger of automatically cutting off power source, it is characterised in that: including power input, on or off module, charging electricity Current voltage conversion module, rechargeable battery, sampling module and comparison process module, the sampling module include voltage detection module and Current detection module, wherein the power input, on or off module, charging voltage and current conversion module, rechargeable battery according to The input terminal of secondary electric connection, the voltage detection module and current detection module and the charging voltage and current conversion module are defeated Outlet is electrically connected, the output end and comparison process module input terminal electricity of the voltage detection module and current detection module Property connection, the output end of the comparison process module and the on or off module are electrically connected.

2. the charger of automatically cutting off power source according to claim 1, it is characterised in that: the comparison process module includes Comparison circuit and control circuit, the output with voltage detection module and current detection module respectively of the input terminal of the comparison circuit End is electrically connected, and the output end and control circuit of the comparison circuit are electrically connected, the control circuit and on or off module Input terminal is electrically connected.

3. the charger of automatically cutting off power source according to claim 2, it is characterised in that: the on or off module is can Control ON-OFF control circuit.

4. the charger of automatically cutting off power source according to any one of claims 1 to 3, it is characterised in that: the charging electricity Current voltage conversion module includes sequentially connected EMI filter circuit, current rectifying and wave filtering circuit, DC/DC converter and output rectification Filter circuit, the input terminal of the EMI filter circuit and the output end of on or off module are electrically connected, the output rectification filter The output end of wave circuit is electrically connected with rechargeable battery and sample circuit respectively.

5. the charger of automatically cutting off power source according to claim 2, it is characterised in that: the comparison process module is also set It being equipped with and turns circuit for lamp, the circuit for lamp that turns includes several indicator lights, and it is described to turn circuit for lamp and control circuit electric connection, for showing Show the state of charger.

6. the charger of automatically cutting off power source according to claim 5, it is characterised in that: the indicator light is LED light.